Air hammer



FIG. 1 is a perspective view of an air hammer showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings represent unclaimed environmental subject matter. 

The ornamental design for an air hammer, as shown and described. 